Have a Problem & Need help!!!

I have a 2002 BAM S3, over the last couple of months the Lambda sensor in the downpipe seems to be removing itself! First time I took it to a mate and he diagnosed it as many other garages were saying it was a crack in the downpipe! Whilst I was with him he managed to get it back in place and tightened up, result I thought! Now 3 months down the line, was going round a roundabout last night and it has come out again.

Has anyone else experienced this problem and is there anyway I can get some form of locktite to hold it in place?

I live just south of london, I think I have sorted it... went to Audi to see if there was a washer which had come of when it fell out, apparently not!
So I went to halfords and got some locktite and some washers, cleaned up the bolt added the washer and locktite and put it back in, have driven it around for a while today and it seems fine, the thread seemed ok and went back in very smoothly so don't think its threaded... hopefully the washer will give it a bit more bite!

Steve, take it to any local garage with a welder.
So long as it seals in place, if its just popping out, just get them to tack a small weld on the side against the DP only needs to be tiny.
When it needs to be removed (ie if you need a new dp) it will be smple enough to just grind off, or indeed proabbly torque off.

take few mis to do only and will be a secure fix and take the worry out of the loctite fix!
BTW if the seal is not tight, a bit of exhaust past on the rhreads will help prior to takcing ti in place. Or you can get some extremely expensive but extremely high temp silicone exhuast sealer which will do the trick too.

I had a similar problem with the turbo to manifold bolt coming out all the time
kept happening every week or so, in the end i got a brand new bolt and split-washer and used exhaust sealant on the thread and it hasnt bothered me for months now!

I tried using locktite but the temperature of the exhaust just melts it so its useless!

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